# Relationship history for MSHA mine 3101538

Current hierarchy: **Setzer Ford E → Ford E Setzer Company → Mc Lin Creek Pit**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Ford E Setzer Company → Mc Lin Creek Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Setzer Ford E → Mc Lin Creek Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Setzer Ford E → Ford E Setzer Company; 1950-01-01 to current/open; source msha-controller-operator-history